You will have first to select which band and subbands are to be used, with
command SET SELECTION. The format is

SET SELECTION key band subbands

`key' may be LINE or CONTINUUM; use CONTINUUM to
obtain a table with a single channel, and LINE to obtain a table with
multi-channel data. `band' may be USB, LSB, or DSB (the
latter is allowed for continuum mode only, and produces two records: one
for each sideband). Finally `SUBBANDS' is a group of subbands, like
C01 to C06 or L01 to L02, to be averaged in continuum mode, and
concatenated in line mode (overlapping spectral bands will cause a
resampling to occur).

The table itself will be a file in the Gildas Data Format, of dimensions
[
], for channels and visibilities. The lines contain:

U in meters

V in meters

W in meters

Observation date (integer CLASS day number)

Time in seconds since above date

Number of start antenna

First frequency point (real part)

First frequency point (imaginary part)

First frequency point (weight)

Same for second frequency point, and so on

The data weights are controlled by command SET WEIGHTS. SET
WEIGHT TSYS ON will turn on weighting by , and SET
WEIGHT CALIBRATION ON will turn on weighting by , where
is the amplitude instrumental calibration factor (if amplitudes
are relative). Both weighting factors may be applied simultaneously. If
both factors are OFF, data is weighted proportionally to observing
time.

Do not forget to SET PHASE RELATIVE, SET RF ON, and SET
AMPLITUDE RELATIVE before you invoke command TABLE, otherwise you
will tabulate uncalibrated data.
The command TABLE itself should contain the name of the table:
TABLE Name Status [/RESAMPLE nc ref val res code]
where `Status' is NEW to create a new table or OLD to extend an
existing one (default). The default and recommended file extension for the
UV Table is .UVT.

Option /RESAMPLE resamples the spectrum to a different velocity or
frequency resolution, or to select a part of the spectrum only; see
internal help for details.